package org.hbhk.hms.mq.tx.provider;

import java.lang.reflect.Field;

import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
import org.springframework.aop.framework.AopProxyUtils;
import org.springframework.aop.support.AopUtils;

public class AopTargetUtil {

	/**
	 * 获取 目标对象
	 * 
	 * @param proxy 代理对象
	 * @return
	 * @throws Exception
	 */
	public static Object getTarget(Object proxy) throws Exception {

		if (!AopUtils.isAopProxy(proxy)) {
			return proxy;// 不是代理对象
		}

		if (AopUtils.isJdkDynamicProxy(proxy)) {
			return getJdkDynamicProxyTargetObject(proxy);
		} else { // cglib
			return getCglibProxyTargetObject(proxy);
		}

	}

	private static Object getCglibProxyTargetObject(Object proxy) throws Exception {
		Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");
		h.setAccessible(true);
		Object dynamicAdvisedInterceptor = h.get(proxy);

		Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");
		advised.setAccessible(true);

		Object target = ((AdvisedSupport) advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();

		return target;
	}

	private static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {
		Field h = proxy.getClass().getSuperclass().getDeclaredField("h");
		h.setAccessible(true);
		AopProxy aopProxy = (AopProxy) h.get(proxy);

		Field advised = aopProxy.getClass().getDeclaredField("advised");
		advised.setAccessible(true);

		Object target = ((AdvisedSupport) advised.get(aopProxy)).getTargetSource().getTarget();
		return target;
	}

	public static String getJdkDynamicProxyTargeInterface(Object proxy) throws Exception {
		Object target = getTarget(proxy);
		Class<?>[] cls = AopProxyUtils.proxiedUserInterfaces(target);
		Class<?> interfaceCls = cls[0];
		return interfaceCls.getName();
	}

	public static Class<?> getProxyInterface(Object proxy) {
		Object target = null;
		try {
			target = getTarget(proxy);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
		Class<?>[] cls = AopProxyUtils.proxiedUserInterfaces(target);
		Class<?> interfaceCls = cls[0];
		return interfaceCls;
	}

	public static Class<?> getJdkDynamicProxyTargeClass(Object proxy) throws Exception {
		Object target = getTarget(proxy);
		Class<?>[] cls = AopProxyUtils.proxiedUserInterfaces(target);
		Class<?> interfaceCls = cls[0];
		return interfaceCls;
	}
}
